They must be asleep.
4 seconds sound clip from the One Ham's Family (Tex Avery, 1943) movie soundboard.
You can hear this line at 00:01:55 in the Blu-ray version of the movie.
Quote context
[...]
- So, Junior, if you want a lot of nice toys, you'll go to sleep and be a good little boy.
- Well, here I is. I wouldn't get out of me wittle bed.
- Daddy, mommy, are you awake?
- I will now find out what all this Santy Clause business is about.
- I got me good brakes, haven't I, folks?
- Well, what do you know! Saint Nicholas. What you know, Nick?
- Err, Oh, Merry Christmas, my little man.
[...]